Misfiring system
- Thread starter Bunta
- Start date
A misfiring system is good. IF YOU ARE RICH/SPONSERED!
What is does it at the set RPM point it removes spark and continues dumping fuel. Causing the raising engine combustion temp to DETONATE the raw fuel. Kepping you engine in a high RPM and keeping your turbo spooled.
Why you must be rich/sponsered:
DETONATION! Kills you turbie, kills rings KILLS MOTORS!
Be very carful!
What is does it at the set RPM point it removes spark and continues dumping fuel. Causing the raising engine combustion temp to DETONATE the raw fuel. Kepping you engine in a high RPM and keeping your turbo spooled.
Why you must be rich/sponsered:
DETONATION! Kills you turbie, kills rings KILLS MOTORS!
Be very carful!
The misfiring system that you might be talking about is traditionally called a "anti-lag system". What this dose is retard the ignition timing when the module sees a certain percentage of throttle lift or lift after a certain tps voltage. You can tune these variables to optimize efficiency of your anti-lag system.
When the ignition is retarded upon releasing the throttle timing can be pulled back as much as 40 degrees from its initial btdc number. This excessive timing setting ignites the fuel in the cylinder after top dead center. blah blah different exhaust cams require different tuning of your anti-lag system. The idea is to get the fuel in the cylinder to burn after the exhaust valve is opened so you keep the turbine inertia while decelerating. Thus when you reapply the throttle you dont have to wait for the increase in exhaust velocity to get the slow turbine spinning.
I could speculate to say that piston ring damage could happen over time because while the timing is being retarded and not burnt before top dead center the cylinder walls are being washed with fuel. After time it will loose compression. There is more excessive wear to the exhaust valves, turbo manifold and turbo due to the egt average increasing 400C degrees over normal racing operation.
Detonation is an uneven burn of fuel ignited from not having high enough octane per cylinder pressure or hot spots in the cylinder which spontaneously ignite which generates multiple flame fronts. This happens after the ignition event. The particular anti-lag system purposely ignites the fuel after top dead center (more commonly where detonation would occur) but I wouldn’t call it detonation if the engine management system(s) are sending the ignition spark later.
poorman's ALS, left foot braking to keep a load on the engine.
When the ignition is retarded upon releasing the throttle timing can be pulled back as much as 40 degrees from its initial btdc number. This excessive timing setting ignites the fuel in the cylinder after top dead center. blah blah different exhaust cams require different tuning of your anti-lag system. The idea is to get the fuel in the cylinder to burn after the exhaust valve is opened so you keep the turbine inertia while decelerating. Thus when you reapply the throttle you dont have to wait for the increase in exhaust velocity to get the slow turbine spinning.
I could speculate to say that piston ring damage could happen over time because while the timing is being retarded and not burnt before top dead center the cylinder walls are being washed with fuel. After time it will loose compression. There is more excessive wear to the exhaust valves, turbo manifold and turbo due to the egt average increasing 400C degrees over normal racing operation.
Detonation is an uneven burn of fuel ignited from not having high enough octane per cylinder pressure or hot spots in the cylinder which spontaneously ignite which generates multiple flame fronts. This happens after the ignition event. The particular anti-lag system purposely ignites the fuel after top dead center (more commonly where detonation would occur) but I wouldn’t call it detonation if the engine management system(s) are sending the ignition spark later.
poorman's ALS, left foot braking to keep a load on the engine.
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I never knew they even mentioned misifiring systems in Initial D... anyway, I've been wondering about misfiring systems as well and I thought that was a wicked write-up 240Sickness. I guess a misfiring system in a daily-driver is out of the question, pteh.
Alchemist XL
Driver
Kenrik said:
Good informative posts, z4k and 240sickness.
kenchick listen, its a technical forum, save the smart remarks for the off topic section dummy.
On topic:
This is impractical for someone's street car, even racing with a capacity on sponsorship funds its probably not worth it. The amount of time you spend tuning the engine for max power and throttle responce then throw a ALS ontop of all that to reak some havoic.
Cant be good. Using this in endurance racing is out of the question, i think this system would use some great amount of extra fuel. An extra pit stop to shave 5 seconds off a stage or set of laps is impractical. It happens to work well in WRC, most closed sanctioned courses dont allow it.
nice, it sounds like you do some profecional racing yourself, or is quite the the racing fan.Brian said:Good informative posts, z4k and 240sickness.
kenchick listen, its a technical forum, save the smart remarks for the off topic section dummy.
On topic:
This is impractical for someone's street car, even racing with a capacity on sponsorship funds its probably not worth it. The amount of time you spend tuning the engine for max power and throttle responce then throw a ALS ontop of all that to reak some havoic.
Alchemist XL
Driver
xero240 said:
stay on topic moderator..... i know a thing or two about engine tech.
ALS' bridge the gap of engine type preferences. The ALS keeps you in boost so when you get back on the gas it has the responce of a na engine. Like on many of your 240's you would like to run a 60-1 (or equivilant) because the tq curve when it gets in its effecncy range is incrediable. On the other hand, some of you are saying "trade your intercoolers and turbo timers in for cams and headers". With an ALS you can have (if setup well) better responce then a NA engine and tons more power w\ the same displacement and responce. Too bad that effect is only short lived. Unfortunatly that one CON prevents many enthusiast from running a ALS'.
Alchemist XL
Driver
I had a ALS on my white car, thats why you always heard it on the rev limiter at the drift events
Alchemist XL
Driver
supercharger if you are a millionare maybe
Alchemist XL said:
Or if you custom fab, i could have done this. Its not redicilous to use teh a\c mounting bracket as a location and have a new crank pulley made. Its not that hard to line up the belts.
I like the idea of a turbo better.
Alchemist XL
Driver
240SicknessX said:Or if you custom fab, i could have done this. Its not redicilous to use teh a\c mounting bracket as a location and have a new crank pulley made. Its not that hard to line up the belts.
I like the idea of a turbo better.
KA24E-S!!!!!!
Kenrik
Driver
I have heard of people supercharging the 240 before.. it costs about the same as a turbo kit but like Rick said you have to do a custom fab mount and not have AC.
http://www.240sx.org/faq/articles/superchargers.htm
http://www.240sx.org/faq/articles/superchargers.htm
RICKY SILEIGHTY
Member
I think it's cheaper to supercharge, checkout www.KA-T.org they have a active thread about a guy supercharging a 240. They even have a link of a supercharged SR20 in Japan. That thing sounds mean on the feed.